Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 10 - Section 10.2 - Study Guide - Assess Your Learning Outcomes - Page 371: 6

Answer

Platysma Muscle Location: Upper chest , neck, and lower face. Actions; Draws lower lip and angle of mouth downward in express horror or surprise. Helps in opening mouth wide.

Work Step by Step

Origin: Fascia of deltoid and pectoralis major Insertion: Mandible; skin; subcutaneous tissue of lower face Innervation: Facial nerve (CN VII)
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